摘要
以硝酸铝、正硅酸乙酯(TEOS)和3-三氯锗丙酸为原料,通过溶胶-凝胶法合成了Al_(12)Si_(3.75)Ge_(0.25)O_(26)莫来石固溶体粉体,并利用热重-差热分析(TG-DSC)、X射线衍射(XRD)、红外光谱(FT-IR)等技术对陶瓷粉体的形成过程进行了表征.对其进行还原处理并对产物的光致发光性能进行了研究,观察到发光峰位于565、613、682、731和777 nm的室温光致发光现象.比较不同还原温度下制备的样品,结果发现500℃还原样品的发光强度最强.通过晶格常数计算并结合XPS研究表明,在500℃还原时已有Ge^(++)从基体中被还原为Ge^0粒子.拉曼光谱显示,500℃还原样品中,Ge^0主要是以平均粒径约为1.95 nm的团簇形式存在.
Al12Si3.75Ge0.25O26 mullite powder was prepared by sol-gel method using Al（NO3）3,Cl3GeCH2CH2COOH and TEOS（Si（OC2H5）4）as precursors.The mullitization process of precursors was monitored by TG-DSC,XRD and FT- IR.After the reduction of Al12Si3.75Ge0.25O26,strong room temperature photoluminescence（PL）can be observed at 565, 613,682,731,and 777 nm,respectively.The PL intensity was related with the reduction temperature,and the sample reduced at 500℃had the highest PL intensity among those samples reduced at different temperatures.The XPS spectra showed that some Ge^4＋ had been reduced to Ge^0 under those temperatures.The average size of Ge nanoparticles was about 1.95 nm estimated by Raman spectra analysis.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2007年第9期1442-1446,共5页
Acta Physico-Chimica Sinica
基金
教育部新世纪优秀人才支持计划(NCET-05-0658)
教育部留学回国人员科研启动基金
关键词
莫来石固溶体
Ge纳米粒子
光致发光
Mullite solid solution
Ge nanoparticles
Photoluminescence
